You would need to do a helicopter Instrument add-on for the FAA. Budget for 25 hrs of training. Also a Comm add may take longer than the minimums.
Do you really need an IR(H)? R22, S300c, R44 and most B206 cannot fly in real IFR.
If you really are not going to do IFR in a heli a better use of the money woud be to get a CFI rating.
For the JAA, getting a multi-engine heli type rating and doing an FAA IR(H) to the JAA IR(H) conversion at minimum time woudl use uo $50,000 USD.